That really depends on the chickens involved. For example if the momma hen is a dominant bird, she will likely be capable of protecting her young right away, especially if the other hens are mellow.
Your rooster may step in as protector of the young and help out.
Your rooster might be aggressive to them - some roosters are dumb that way.
I've seen lots of stories on here where it works well, and just as many where chicks get beat up. I would err on the side of caution and put up a flimsy chicken wire divider between mom and rest of flock until the chicks are a week or two old and you can read how aggressive your other birds may or may not be with the chicks. This also gives the chicks every opportunity to eat as much as they can during those critical first days of life after the yolks are absorbed.
